Uh, those are just non-magnetic tweezers.

But isn't some redness just proof the work was thorough?

Oh that's really nice to hear. It's so cool when you see them start to work together like that. What @jadeg99 said about the puppy makes a lot of sense, having a shared responsibility can totally change how they act with each other. Maybe your kids just reached a point where playing together became more fun than arguing over stuff. It's a good feeling to watch them grow up a little bit like that, isn't it?

Wonder if you'll find any old military gear in that muck. What's the weirdest thing they expect to pull out?

But is turbulence really that big of a deal in practice? I get the theory @the_amy, but I doubt most of us would see a real difference from just tweaking a fan. It seems like one of those things that gets overblown online.